Consider What Porn Does To Society!
Well, actually, it's associated with a decline in sex crimes. As Milton Diamond puts it in this 2009 paper:

It has been found everywhere scientifically investigated that as pornography has increased in availability, sex crimes have either decreased or not increased.

More:

Surprisingly few studies have linked the availability of porn in any society with actual associated antisocial behaviors or sex crimes in particular. None have found a causal relationship and very few have even found one of positive correlation.

Against pornography the work of Donnerstein and Malamuth is frequently presented. Citing Malamuth and his colleagues' work, Donnerstein & Linz (1986) and Donnerstein, Linz, & Penrod, (1987) state that a non-rapist population will show increased sexual arousal after having been exposed to "media-presented images of rape," especially when the female victim demonstrates signs of pleasure and arousal.

This exposure, they further claim, may also lead to a lessened sensitivity toward rape, acceptance of rape myths, and increased self-reported likelihood of raping and self-generated rape fantasies. These were their findings from paper and pencil attitude studies with students, not actual behavior research. These classroom studies, both on methodological as well as theoretical grounds have been strongly criticized e.g., Brannigan & Goldenberg (1987) and Howitt & Cumberbatch (1990).

Overall review of the research available at that time, prepared for the Meese Commission found no causal link between sexual material and antisocial conduct. Indeed, as emphasized by Fagan (1985) in his highly critical review of the findings "a deeply divided Commission concluded that pornography 1) was harmless, even of potential therapeutic and 'cathartic' value; 2) had no negative effects on adults or children; 3) was not a social problem; and 4) its production and distribution should be free from any regulation or control (page 3)." A relatively positive review by Pally (1994) of the 1986 Surgeon General's report found similarly.

And about who uses porn...um...

The police sometimes suggest that a high percentage of sex offenders are found to have used pornography. This is meaningless, since most men have at some time used pornography. And as reported by psychiatrist Robert Stoller, "Men's interest in pornography appears to be statistically normal and sado-masochism may be the most popular ingredient in pornography (Stoller, 1986), page 86)."

Findings by Goldstein and Kant (1973) can also be relevant here. These investigators found that rapists were more likely than non-rapists in the prison population to having been punished for looking at pornography while a youngster. And such was by no means common among the rest of the prison population.

In fact, as reported above, the non-rapists had seen more pornography, and seen it at an earlier age. These investigators also found that what does correlate highly with sex offense is a strict, repressive religious upbringing (Goldstein & Kant, 1973). Green too reported that both rapists and child molesters use less pornography than a control group of "normal" males (Green, 1980).

via @SteveStuWill